//
//  UIColor+ColorString.m
//  megawave
//
//  Created by houzhen on 16/9/16.
//  Copyright © 2016年 multway. All rights reserved.



#import "UIColor+ColorString.h"

@implementation UIColor (ColorString)

+ (UIColor *)colorWithString:(NSString *)stringToConvert{
    
    NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];//字符串处理
    if ([cString length] < 6)
        
        return [UIColor whiteColor];//如果非十六进制，返回白色
    if ([cString hasPrefix:@"#"])
        
        cString = [cString substringFromIndex:1];//去掉头
    
    if ([cString length] != 6)//去头非十六进制，返回白色
        
    return [UIColor whiteColor];

    NSRange range;
    
    range.location = 0;
    
    range.length = 2;
    
    NSString *rString = [cString substringWithRange:range];
    
    
    
    range.location = 2;
    
    NSString *gString = [cString substringWithRange:range];
    
    
    
    range.location = 4;
    
    NSString *bString = [cString substringWithRange:range];
    
    
    
    unsigned int r, g, b;
        
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    
    [[NSScanner scannerWithString:bString] scanHexInt:&b];
    
    
    return [UIColor colorWithRed:((float) r / 255.0f)
            
                           green:((float) g / 255.0f)
            
                            blue:((float) b / 255.0f)
            
                           alpha:1.0];
}
+(UIColor *)colorWithString:(NSString *) stringToConvert Alpha:(CGFloat )alpha

{
    
    NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];//字符串处理
    
    //例子，stringToConvert #ffffff
    
    if ([cString length] < 6)
        
        return [UIColor whiteColor];//如果非十六进制，返回白色
    
    if ([cString hasPrefix:@"#"])
        
        cString = [cString substringFromIndex:1];//去掉头
    
    if ([cString length] != 6)//去头非十六进制，返回白色
        
        return [UIColor whiteColor];
    
    //分别取RGB的值
    
    NSRange range;
    
    range.location = 0;
    
    range.length = 2;
    
    NSString *rString = [cString substringWithRange:range];
    
    
    
    range.location = 2;
    
    NSString *gString = [cString substringWithRange:range];
    
    
    
    range.location = 4;
    
    NSString *bString = [cString substringWithRange:range];
    
    
    
    unsigned int r, g, b;
    
    //NSScanner把扫描出的制定的字符串转换成Int类型
    
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    
    [[NSScanner scannerWithString:bString] scanHexInt:&b];
    
    //转换为UIColor
    
    return [UIColor colorWithRed:((float) r / 255.0f)
            
                           green:((float) g / 255.0f)
            
                            blue:((float) b / 255.0f)
            
                           alpha:alpha];
    
}
@end
